April, 1905.] Notes — Ohio State Herbariuyn. III. 
317 
Some of the outer bracts twice as long as the disk or longer, the longest 
20-7.> mm. long. 5. B. comosa. 
(). Itays none or very short. 7. 
(). Rays large and conspicuous, bright yellow. S. 
7. Outer involucral bracts 4, achenes about .7 mm. long. O. B. discoidca. 
7. Outer bracts (>-<S, achenes (i-<S mm. long. 7. B. jrondosa. 
7. Outer bracts lO-lG, achenes 7-10 mm. long. S. B. vidgala. 
<S. Achenes cuneate, the short awns nari'owly triangular, upwardly 
hispid. 0. H. trichospcrina. 
S. ^Vchenes cuneate to obovate, the slender awns two-thirds the length 
of the achene or more, barbed. 10. B. aristosa. 
1. Bidcits bipinnata L. Stem much branched, 3-8 dm. high. 
Leaves slender petioled, ovate, 1-3-pinnately parted, segments 
ovate, deeplv toothed or lolied. Heads long peduncled, 10-20- 
flowered, involucre oblong, 7 10 mm. high; achenes linear, four- 
sided, narrowed above, 7 15 mm. long, exclusive of the usually 
four downwardly barbed awns. 
In shaded places throughout the state. 
2. Bidens cernua L. Stem sparingly branching above or 
sometimes from the base, 2. 5-4. 5 dm. high. Leaves oblong, 
about 1 cm. wide, acuminate, finely and regularly serrate except 
at the apex and base, cordate-clasihng or connate. Heads few 
to several, erect in flower, nodding in fruit, about S mm. high, 
outer bracts equalling or exceeding the disk ; achenes four-angled, 
cuneate, 4- 5 mm. long, awns four, 2 il mm. long, retrorsely barbed. 
S])ecimens are in the State Herbarium from Cuyahoga, 
(leauga, Lucas, Madison, Mercer, Perry and Wayne Counties. 
3. Bidens elliptica. (Wiegand). Bidens ccniua ellipiica 
Wiegand, Bull. Torr. Club 26:417. 1899. Stem .erect, usually 
freely branching above or sometimes from the base, 3-8 dm. 
high. Leaves elli])tical, typically 12-15 cm. long by 2-3 cm. wide, 
shar])ly serrate along the middle, long acuminate and conspic- 
uously narrowed toward the sessile or barely connate base. 
Heads very numerous, nodding in fruit, outer bracts exceeding 
the disk, ray flowers usually present and conspicuous; achenes 
cuneate, 5-(i mm. long, awns four, retrorsely barbed. 
Abundant in w'et places along streams, apparently through- 
out the state. 
Bidens elliptica is one of the commonest members of the 
genus occurring in Ohio. However, it has never before been 
definitely reported from the state, probably because it is not 
described in the current manuals, where it is included under 
Bidens cernua. When its identitv has been recognized it has 
been frequently confused with Bidens laevis, a coastal plain spe- 
cies with persistently erect heads, not found farther inland than 
central New York. Although originally described bv Wiegand 
as a variety of Bidens cernua, its stouter and branching habit, 
the numerous heads, the l)righter green and larger leaves with 
